add_expr

Defines an expression in this which may be reused to build other parts of a statement.

The new expression will contain the value passed as the ... argument.

If type is G_TYPE_STRING then it is possible to customize how the value has to be interpreted by passing a specific DataHandler object as dh. This feature is very rarely used and the dh argument should generally be null.

Note that for composite types such as Numeric, Gdate, Time, ... pointer to these structures are expected, they should no be passed by value. For example:

GDate *date = g_date_new_dmy (27, G_DATE_MAY, 1972);
id = gda_sql_builder_add_expr (b, NULL, G_TYPE_DATE, date);
g_date_free (date);

id = gda_sql_builder_add_expr (b, NULL, G_TYPE_STRING, "my string");
id = gda_sql_builder_add_expr (b, NULL, G_TYPE_INT, 25);

will correspond in SQL to:

'05-27-1972'
'my string'
25

Parameters:

this	a SqlBuilder object
dh	deprecated useless argument, just pass null
type	the GType of the following argument
...	value to set the expression to, of the type specified by type

Returns:

the ID of the new expression, or typeof (unichar2)0 if there was an error